Magnetic brake.



No. 650,628. Patented May 29, I900.

E. m. BARNES. MAGNETIC BRAKE.

(Application filed Aug. 16; 1899.)

(No Model.)

IIII L.

UNITED STATES PATENT OEErcE.

EDWARD M. nARriEs, or CLEVELAND, omo.

MAGNETIC BRAKE.

SPECIFICATION forming part of Letters Patent No. 650,628, dated May 29,1900.

I Application filed August 16, 1899. Serial No. 727,365. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD M. BARNES, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Magnetic Brakes, of

. which the following is a full, clear, and exact description,reference'being had to the accompanying drawings.

The object of my invention is to provide a simple and efficienttrack-brake for railwaycars. Iaccomplish this by suspending a magneticbrake-shoe on the truck of the car over the track, with provision forsuch movement that when electric current is thrown through the shoe itwill move into engagement with the track and retard the car, the trackconstituting the armature of the magnets.

Theinvention consists of the means hereinafter shown, described, andclaimed by which I make a very simple and satisfactory brakeshoe andeificiently support it.

The drawings clearly show my invention as applied to an ordinary truckof a street-car.

Figure 1 is a side elevation of the truck. Fig. 2 is a plan, partlybroken away, of the brake-shoeand its supporting parts. Fig. 3 is avertical section on the line 3 3 of Fig. 2. Fig. 4 is a side elevation,partly sectional and partly broken away, of the brake-shoe and itssupporting parts. Fig. 5 is a horizontal section on the line 5 5 of Fig.4. Fig. 6 isa diagram illustrating the winding of the shoe, and Fig. 7is a horizontal section on the line 7 7 of Fig. 3.

Referring to the parts by letters, A represents a car-truck of commontype having two parallel longitudinal bars a a on edge and suspendedfrom the journal-box.

13 represents the rail.

The brake-shoe is supported by the bars a a through the intervention ofa bracket 0. This bracket has a horizontal plate a extending beneath thetwo bars, there being a toe c at theiouter edge of the plate, whichextends up onto the outer side of the bar a. The

bracket has also the vertical plate 0 which lies in contact with theinner side of the bar a. The bracket is held to the bars by thescrew-bolts D passing through a plate E on the top of the bars andscrewing into the plate 0. On the bracket 0 are a pair of bosses 0 0which receive studs from the brake-shoe, as hereinafter described.

The brake-shoe is designated F. It consists of the back plate f, havinga series of integrally-projecting pole-pieces f and the integral endpieces f The pole-pieces, of which four pairs are shown, are wound tobecome horseshoe-magnets, and there may be anydesirednumberofthesepairs.Thewinding G is preferably about alternate poles only,

as this is cheaper than winding all of them and gives the magnet therequired strength. The course of the winding and its magnetic effect isindicated in the diagram Fig. 6, where each of the poles around whichthe winding takes is a north pole, (designated N,) and the other polesare south poles, (8.) After the winding G is in place, side platesf aresecured to the back piece, preferably by screws. A suitable filling, ascement, H is packed in about the wound and unwound poles, and a bottomplate f made of brass, so as not to close the magnetic circuit, and

having holes for the projecting poles closes in the filling and winding,being held in suitable manner, as by the bolts f. A multipolar magnet isthus provided, which has projecting ends adapted to form a veryeflicient braking-surface.

Extending upward from the brake-shoe are a pair of studs J, whichpreferably screw into the back f and into two of the pole-pieces f.These studs extend through openings 0 in the bosses c of the bracket 0,and above the bosses are surrounded by helical protrusile springs K,which are compressed and adjusted by the nuts L L. The brake-shoe isthus elastically supported above the rail and normally out of contactwith it, but may move into contact therewith whenever current passesaround the coils G. The terminals g of these coils may be connected bythe controller either with the trolley-current or with the car-motors asgenerators.

If the brake is in engagement when the car is going around a curve, thecenter of the openings 0 in the bosses would not be over the center ofthe tread of the rail, and for this reason I make these openings flaringlaterally from top to bottom, so that the shoe may swing outward orinward, as the case may be, to remain in contact with the tread of therail.

I f extending downward from the back plate,

the straight fiat base-plate f of non-magnetic material engaging withsaid sides and ends and having a plurality of openings through it, aseries of pole-pieces carried by said back plate in a straight row andextending through the openings in said base-plate whereby they may becaused to simultaneously engage a straight rail, and electric windingswith the box, substantially as described.

2. A brake-shoe having a back plate f, the integral pole projections flying in a straight line, the end plates f the winding Garound some ofsaid poles, side plates f the baseplate f of non-magnetic materialinclosing the coils and having holes through which the pole-piecesproject, and a pair of studs J extending from the back plate f,substantially as described.

3. A rigid bracket 0 consisting of a plate 0 adapted to extend beneath atruck-beam, a plate 0 adapted to lie along a vertical side of saidtruck-beam, and bosses 0 above the plate 0 and joining both plates,combined with a magnetic brake-shoe carrying studs extending from itthrough openings in said bosses, substantially as described.

at. The combination, with a pair of parallel bars of a truck, of abracket G, bolts D lying between the bars and securing the bracketthereto, a pair of bosses carried by the bracket, vertical holes throughthe bosses, studs going through the holes and a brake-shoe carried bythe studs, substantially as described.

5. The combination, with a railway-car, of a bracket carried thereby andhaving openings therein, a brake-shoe having a pair of studs lying insaid openings, means tending to retain the brake-shoe elevated, therebeing play between the walls of said openings and the studs in a lateraldirection but not in a longitudinal direction, substantially asdescribed.

6. The combination with a car of a bracket carried thereby havingvertical holes extending through it which holes flare laterally but notlongitudinally, a brake-shoe having studs extending through said holes,and springs surrounding the studs and tending to hold the brake-shoe outof engagement with the rail, substantially as described.

7. The combination with a railway-truck, of a bracket adapted to besecured thereto, said bracket carrying bosses 0 vertical holes throughsaid bosses which holes flare downward laterally but notlongitudinally,a brakeshoe having studs extending through said holes and engaging withthe front and rear walls thereof, springs surrounding said studs andbearing on the bosses, and means carried by the studs for holding thesprings compressed, substantially as described.

In testimony whereof I hereunto aflix my signature in the presence oftwo witnesses.

EDWARD M. BARNES.

WVitnesses:

E. B. GILOHRIST, ALBERT H. BATES.

